Coil spring



The coil spring is used in furniture, such as beds, mattresses andsofas.

FIG. 1 is a front view of the coil spring showing my design.

FIG. 2 is a side view thereof;

FIG. 3 is a perspective view thereof; and,

FIG. 4 is a top view thereof.

The ornamental design for a coil spring, as shown and described.